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Chen W, Ru H, Yan F, Mo X. Simple and direct electrochemical detection of rosmarinic acid in food samples based on nanochannel modified carbon electrode. RSC Adv 2024; 14:18599-18607. [PMID: 38863812 PMCID: PMC11165691 DOI: 10.1039/d4ra03063j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Accepted: 06/05/2024] [Indexed: 06/13/2024] Open
Abstract
The detection of rosmarinic acid (Ros A) in food samples holds major significance. Simple and convenient electrochemical detection of Ros A with high performance remains a challenge. In this work, a nanochannel array-modified carbon electrode was constructed using a simple and convenient approach to achieve highly sensitive electrochemical detection of Ros A in food samples. Through simple electrochemical pre-activation of a glassy carbon electrode (GCE), oxygen-containing functional groups were introduced on the electrode surface (p-GCE). Vertically-ordered mesoporous silica film (VMSF) was stably grown on p-GCE through electrochemical-assisted self-assembly (EASA) without the introduction of another adhesive layer (VMSF/p-GCE). Transmission electron microscopy (TEM) characterization demonstrated the highly ordered structure of VMSF with a nanochannel diameter around 2.7 nm. Both p-GCE and the nanochannels significantly enhanced the electrochemical signals of Ros A on the electrode, exhibiting dual signal amplification. VMSF/p-GCE demonstrated sensitive detection of Ros A with a linear range of 500 nM to 1 μM and 1 μM to 35 μM. The detection limit (DL) was 26 nM. Combining the good anti-fouling and anti-interference properties of the nanochannels, VMSF/p-GCE can achieve direct electrochemical detection of Ros A in food samples. The sensor can be easily regenerated for repeated use. The simple fabrication, high detection sensitivity and selectivity of the sensor make it a new strategy for rapid preparation of high-performance electrochemical sensors.
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Affiliation(s)
- Wenbo Chen
- Guangxi Medical University Cancer Hospital, Guangxi Medical University 71 Hedi Road Nanning 530021 P. R. China
| | - Hongjuan Ru
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University Xiasha Higher Education Zone, 928 Second Avenue Hangzhou 310018 P. R. China
| | - Fei Yan
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University Xiasha Higher Education Zone, 928 Second Avenue Hangzhou 310018 P. R. China
| | - Xianwei Mo
- Guangxi Medical University Cancer Hospital, Guangxi Medical University 71 Hedi Road Nanning 530021 P. R. China
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2
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Zhou Y, Wang H, Xi F, Lu C. Sensitive Electrochemical Detection of Carcinoembryonic Antigen Based on Biofunctionalized Nanochannel Modified Carbonaceous Electrode. Molecules 2024; 29:858. [PMID: 38398610 PMCID: PMC10892148 DOI: 10.3390/molecules29040858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/10/2024] [Accepted: 02/12/2024] [Indexed: 02/25/2024] Open
Abstract
The convenient construction of carbon-based electrochemical immunosensors with high performance is highly desirable for the efficient detection of tumor biomarkers. In this work, an electrochemical immunosensor was fabricated by integrating a biofunctionalized mesoporous silica nanochannel film with a carbon-based electrode, which can enable the sensitive determination of carcinoembryonic antigen (CEA) in serum. The commonly used carbonaceous electrode, glassy carbon electrode (GCE), was employed as the supporting electrode and was pre-treated through electrochemical polarization to achieve the stable binding of a vertically ordered mesoporous silica film with amino groups (NH2-VMSF) without the use of any adhesive layer. To fabricate the immunorecognition interface, antibodies were covalently immobilized after the amino groups on the outer surface of NH2-VMSF was derivatized to aldehyde groups. The presence of amino sites within the high-density nanochannels of NH2-VMSF can facilitate the migration of negatively charged redox probes (Fe(CN)63-/4-) to the supporting electrode through electrostatic adsorption, leading to the generation of electrochemical signals. In the presence of CEA, the formation of immunocomplexes on the recognitive interface can reduce the electrochemical signal of Fe(CN)63-/4- on the supporting electrode. Based on this principle, the sensitive electrochemical detection of CEA was achieved. CEA can be determined to range from 0.01 ng mL-1 to 100 ng mL-1 with a limit of detection of 6.3 pg mL-1. The fabricated immunosensor exhibited high selectivity, and the detection of CEA in fetal bovine serum was achieved.
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Affiliation(s)
- Yucheng Zhou
- General Surgery, Cancer Center, Department of Gastrointestinal and Pancreatic Surgery, Zhejiang Provincial People’s Hospital, Hangzhou Medical College, Hangzhou 310014, China;
- Key Laboratory of Gastroenterology of Zhejiang Province, Hangzhou 310014, China
| | - Hongxin Wang
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China;
| | - Fengna Xi
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China;
| | - Chao Lu
- General Surgery, Cancer Center, Department of Gastrointestinal and Pancreatic Surgery, Zhejiang Provincial People’s Hospital, Hangzhou Medical College, Hangzhou 310014, China;
- Key Laboratory of Gastroenterology of Zhejiang Province, Hangzhou 310014, China
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3
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Huang Z, Luo X, Yan F, Zhou B. Homogeneous Electrochemical Aptasensor for Sensitive Detection of Zearalenone Using Nanocomposite Probe and Silica Nanochannel Film. Molecules 2023; 28:7241. [PMID: 37959660 PMCID: PMC10647457 DOI: 10.3390/molecules28217241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 10/20/2023] [Accepted: 10/21/2023] [Indexed: 11/15/2023] Open
Abstract
Developing rapid and efficient analytical methods is of great importance for food safety Herein, we present a novel homogeneous electrochemical aptasensor for ultrasensitive quantitative determination of zearalenone (ZEN) based on a nanocomposite probe and silica nanochannel film. X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and UV-Vis characterization techniques confirm that graphene oxide (GO) bears an aromatic conjugated structure, along with hydroxyl and carboxyl groups, facilitating the subsequent adsorption of cationic redox hexa-ammine-ruthenium (III) (Ru(NH3)63+) and anionic ZEN aptamer, to form a Ru(NH3)63+-ZEN aptamer-GO nanocomposite probe in a homogeneous solution. Vertically-ordered mesoporous silica films (VMSF) bearing silanol groups can be simply grown on the solid indium tin oxide (ITO) electrode surface and enable the selective preconcentration of Ru(NH3)63+, eventually leading to signal amplification. Since the detachment of Ru(NH3)63+ from the GO surface by the recognized ZEN aptamer in the presence of ZEN, more free Ru(NH3)63+ is released in solution and produces enhanced redox signals at the VMSF modified ITO electrode, allowing quantitative detection of ZEN. On the basis of the above sensing strategy, the proposed homogeneity, due to the assistance of graphene, as well as of the signal amplification and anti-fouling effects of VMSF, accurate analysis of ZEN can be realized in maize and Chinese chestnut samples.
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Affiliation(s)
- Zhongnan Huang
- Collaborative Innovation Centre of Regenerative Medicine and Medical Bioresource Development, Application Co-Constructed by the Province and Ministry, Guangxi Medical University, Nanning 530021, China;
| | - Xuan Luo
- Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Department of Chemistry, School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China;
| | - Fei Yan
- Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Department of Chemistry, School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China;
| | - Bo Zhou
- Collaborative Innovation Centre of Regenerative Medicine and Medical Bioresource Development, Application Co-Constructed by the Province and Ministry, Guangxi Medical University, Nanning 530021, China;
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4
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Lv Y, Zhang Y, Yang Y, Li J, Wang J, Xiao X, Zhang M. Strategy of In Situ Electrochemical Regulation for Highly Enhanced Nonenzymatic Sensing of Carbaryl. Anal Chem 2023; 95:4015-4023. [PMID: 36802553 DOI: 10.1021/acs.analchem.2c04373] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Specific and sensitive sensing of most pesticide residues relies on enzymes such as acetylcholinesterase and advanced materials, which need to be loaded on the surface of working electrodes, leading to instability, uneven surface, tedious process, and high cost. Meanwhile, employing certain potential or current in electrolyte solution could also modify the surface in situ and overcome these drawbacks. However, this method is only regarded as electrochemical activation widely applied in the pretreatment of electrodes. In this paper, by means of regulating the electrochemical technique and its parameters, we prepared a proper sensing interface and derivatized the carbaryl (a carbamate pesticide) hydrolyzed form (1-naphthol) to enhance sensing by 100 times within several minutes. After regulation I by chronopotentiometry with 0.2 mA for 20 s or chronoamperometry with 2 V for 10 s, abundant oxygen-containing groups form and the ordered carbon structure is destroyed. Sweeping from -0.5 to 0.9 V through cyclic voltammetry for only one segment, following regulation II, the composition of oxygen-containing groups changes and the disordered structure is alleviated. Finally, on the constructed sensing interface, test by regulation III through differential pulse voltammetry from 0.8 to -0.4 V, resulting in derivatization of 1-naphthol during 0.8-0 V, followed by electroreduction of the derivative at around -0.17 V. Compared with the electro-oxidation peak at 0.5 V in previous reports, it is essential to improve specificity, even toward several other carbamate pesticides with similar structures. Hence, the in situ electrochemical regulation strategy has demonstrated great potential for effective sensing of electroactive molecules.
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Affiliation(s)
- Yitao Lv
- College of Food Science and Engineering, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100, China
| | - Yi Zhang
- College of Food Science and Engineering, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100, China
| | - Yunyin Yang
- College of Food Science and Engineering, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100, China
| | - Jingyan Li
- College of Food Science and Engineering, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100, China
| | - Jiacheng Wang
- Medical College, Yangzhou University, No. 11 Huaihai Road, Yangzhou, Jiangsu 225009, China
| | - Xilin Xiao
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China
| | - Min Zhang
- College of Food Science and Engineering, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100, China
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5
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Deng X, Lin X, Zhou H, Liu J, Tang H. Equipment of Vertically-Ordered Mesoporous Silica Film on Electrochemically Pretreated Three-Dimensional Graphene Electrodes for Sensitive Detection of Methidazine in Urine. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13020239. [PMID: 36677991 PMCID: PMC9861598 DOI: 10.3390/nano13020239] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 12/29/2022] [Accepted: 01/01/2023] [Indexed: 05/27/2023]
Abstract
Direct, rapid, and sensitive detection of drugs in complex biological samples is essential for drug abuse control and health risk assessment. In this work, an electrochemical sensor was fabricated based on equipment of vertically-ordered mesoporous silica film (VMSF) on an electrochemically pre-treated three-dimensional graphene electrode (p-3DG), which can achieve direct and sensitive determination of methylthiopyridazine (TR) in urine. Three-dimensional graphene (3DG) with a continuous and interpenetrating graphene network was used as the supporting electrode and simple electrochemical polarization was employed to pre-treat 3DG to improve surface hydrophilicity and electrocatalytic performance. VMSF was easily grown using an electrochemical assisted self-assembly method within 10 s and was stably bound to the p-3DG surface. The nanochannel array on the as-prepared VMSF/p-3DG sensor enriched positively charged TR, leading to significantly improved electrochemical signal. Combined with the high electric activity of p-3DG and the enrichment of nanochannels, VMSF/p-3DG realized sensitive determination of TR ranging from 50 nM to 10 μM with a low detection limit (DL, 30 nM). Owing to the anti-fouling and anti-interference performance of VMSF, the common electroactive molecules including ascorbic acid (AA) and uric acid (UA) did not interfere with the detection. In addition, the detection of TR in buffer and urine exhibited similar sensitivity. Accurate detection of TR in urine was realized.
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Affiliation(s)
- Xiaochun Deng
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Xueting Lin
- The First Clinical Faculty of Guangxi University of Chinese Medicine, Nanning 530200, China
| | - Huaxu Zhou
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Jiyang Liu
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Hongliang Tang
- Affiliated Fangchenggang Hospital, Guangxi University of Chinese Medicine, Fangchenggang 538001, China
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Yan Z, Xing J, He R, Guo Q, Li J. Probe-Integrated Label-Free Electrochemical Immunosensor Based on Binary Nanocarbon Composites for Detection of CA19-9. Molecules 2022; 27:molecules27206778. [PMID: 36296370 PMCID: PMC9607002 DOI: 10.3390/molecules27206778] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 09/25/2022] [Accepted: 10/01/2022] [Indexed: 11/16/2022] Open
Abstract
Convenient and sensitive detection of tumor biomarkers is crucial for the early diagnosis and treatment of cancer. Herein, we present a probe-integrated and label-free electrochemical immunosensor based on binary nanocarbon composites and surface-immobilized methylene blue (MB) redox probes for detection of carbohydrate antigen 199 (CA19-9), which is closely associated with gastric malignancies. Nanocarbon composites consisting of electrochemically reduced graphene oxides and carbon nanotubes (ErGO-CNT) are electrodeposited onto an indium tin oxide (ITO) electrode surface to form a 3D nanocomposite film, which could provide high surface area to immobilize abundant MB probes, facilitate the electron transfer of MB, and therefore, improve sensitivity. Polydopamine (PDA) served as a bifunctional linker is able to immobilize anti-CA19-9 antibodies and stabilize the inner probe, conferring the sensing interface with specific recognition capacity. Electrochemical detection of CA19-9 is achieved based on the decrease of the redox signal of MB after specific binding of CA19-9 with a wide linear range of 0.1 mU/mL to 100 U/mL and a limit of detection (LOD) of 0.54 nU/mL (S/N = 3). The constructed electrochemical immunosensor has good selectivity, repeatability, reproducibility, and stability. Furthermore, determination of CA19-9 in human serum samples is also realized.
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Affiliation(s)
- Zhengzheng Yan
- General Surgery Department, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan 030032, China
| | - Jun Xing
- Department of Breast Surgery, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan 030032, China
- Correspondence:
| | - Ruochong He
- General Surgery Department, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan 030032, China
| | - Qinping Guo
- General Surgery Department, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan 030032, China
| | - Ji Li
- General Surgery Department, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan 030032, China
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7
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Boz EB, Boillat P, Forner-Cuenca A. Taurine Electrografting onto Porous Electrodes Improves Redox Flow Battery Performance. ACS APPLIED MATERIALS & INTERFACES 2022; 14:41883-41895. [PMID: 36069702 PMCID: PMC9501779 DOI: 10.1021/acsami.2c08211] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 08/12/2022] [Indexed: 06/15/2023]
Abstract
The surface properties of porous carbonaceous electrodes govern the performance, durability, and ultimately the cost of redox flow batteries (RFBs). State-of-the-art carbon fiber-based electrode interfaces suffer from limited kinetic activity and incomplete wettability, fundamentally limiting the performance. Surface treatments for electrodes such as thermal and acid activation are a common practice to make them more suitable for aqueous RFBs; however, these treatments offer limited control over the desired functional properties. Here, we propose, for the first time, electrografting as a facile, rapid, and versatile technique to enable task-specific functionalization of porous carbonaceous electrodes for use in RFBs. Electrografting allows covalent attachment of organic molecules on conductive substrates upon application of an electrochemical driving force, and the vast library of available organic molecules can unlock a broad range of desired functional properties. To showcase the potential of electrografting for RFBs, we elect to investigate taurine, an amine with a highly hydrophilic sulfonic acid tail. Oxidative electrografting with cyclic voltammetry allows covalent attachment of taurine through the amine group to the fiber surface, resulting in taurine-functionalized carbon cloth electrodes. In situ polarization and impedance spectroscopy in single-electrolyte flow cells reveal that taurine-treated cloth electrodes result in 40% lower charge transfer and 25% lower mass transfer resistances than off-the-shelf cloth electrodes. We find that taurine-treated electrode interfaces promote faster Fe3+ reduction reaction kinetics as the electrochemical surface area normalized current densities are 2-fold and 4-fold higher than oxidized and untreated glassy carbon surfaces, respectively. Improved mass transfer of taurine-treated electrodes is attributed to their superior wettability, as revealed by operando neutron radiography within a flow cell setup. Through demonstrating promising results for aqueous systems with the model molecule taurine, this work aims to bring forth electrografting as a facile technique to tailor electrode surfaces for other RFB chemistries and electrochemical technologies.
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Affiliation(s)
- Emre B. Boz
- Electrochemical
Materials and Systems, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- Eindhoven
Institute for Renewable Energy Systems, Eindhoven University of Technology,
P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Pierre Boillat
- Electrochemistry
Laboratory, Paul Scherrer Institute, Forschungsstrasse 111, CH-5232 Villigen, Switzerland
- Laboratory
for Neutron Scattering and Imaging, Paul
Scherrer Institute, Forschungsstrasse
111, CH-5232, Villigen, Switzerland
| | - Antoni Forner-Cuenca
- Electrochemical
Materials and Systems, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- Eindhoven
Institute for Renewable Energy Systems, Eindhoven University of Technology,
P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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8
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Chang Q, Huang J, He L, Xi F. Simple immunosensor for ultrasensitive electrochemical determination of biomarker of the bone metabolism in human serum. Front Chem 2022; 10:940795. [PMID: 36092672 PMCID: PMC9458950 DOI: 10.3389/fchem.2022.940795] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 08/01/2022] [Indexed: 01/07/2023] Open
Abstract
Ultrasensitive and selective determination of biomarkers of the bone metabolism in serum is crucial for early screening, timely treatment, and monitoring of the curative effect of osteoporosis, which is a silent disease with serious health threats. Immunoassay with a simple sensing interface and ultrahigh sensitivity is highly desirable. Herein, a simple electrochemical immunosensor is demonstrated based on gold nanoparticles (AuNPs) electrodeposited on chitosan-reduced graphene oxide (CS-G) composite modified electrode, which can achieve sensitive determination of the important biomarker of bone metabolism, bone gamma-carboxyglutamate protein (BGP). To overcome the agglomeration of graphene and introduce a biocompatible matrix with functional amino groups, CS-G is prepared and modified on the supporting glassy carbon electrode (GCE). Then, AuNPs are electrodeposited on CS-G through their interaction between amine groups of CS. The immobilized AuNPs provide numerous binding sites to immobilize anti-BGP antibodies (AbBGP). The specific recognition between BGP and AbBGP results in a reduction in the mass transfer of the electrochemical probe (Fe(CN)63-/4-) in solution, leading to a reduced electrochemical signal. Based on this mechanism, fast and ultrasensitive electrochemical detection of BGP is achieved when the concentration of BGP ranges from 100 ag ml−1 to 10 μg mL−1 with a limit of detection (LOD) of 20 ag ml−1 (S/N = 3). The determination of BGP in human serum is also realized with high reliability.
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Affiliation(s)
- Qiang Chang
- Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, China
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jie Huang
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou, China
| | - Liming He
- Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, China
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fengna Xi
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou, China
- *Correspondence: Fengna Xi,
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Zhou H, Dong G, Sailjoi A, Liu J. Facile Pretreatment of Three-Dimensional Graphene through Electrochemical Polarization for Improved Electrocatalytic Performance and Simultaneous Electrochemical Detection of Catechol and Hydroquinone. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 12:65. [PMID: 35010015 PMCID: PMC8746492 DOI: 10.3390/nano12010065] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/17/2021] [Accepted: 12/23/2021] [Indexed: 05/04/2023]
Abstract
Three-dimensional graphene (3DG) with macroporous structure has great potential in the field of electroanalysis owing to a large active area, excellent electron mobility and good mass transfer. However, simple and low-cost preparation of 3DG electrodes with high electrocatalytic ability is still a challenge. Here, a fast and convenient electrochemical polarization method is established to pretreat free-standing 3DG (p-3DG) to offer high electrocatalytic ability. 3DG with monolithic and macroporous structure prepared by chemical vapor deposition (CVD) is applied as the starting electrode. Electrochemical polarization is performed using electrochemical oxidation (anodization) at high potential (+6 V) followed with electrochemical reduction (cathodization) at low potential (-1 V), leading to exposure of edge of graphene and introduction of oxygen-containing groups. The as-prepared p-3DG displays increased hydrophilicity and improved electrocatalytic ability. As a proof of concept, p-3DG was used to selective electrochemical detection of two isomers of benzenediol, hydroquinone (p-BD) and catechol (o-BD). In comparison with initial 3DG, p-3DG exhibits increased reversibility of redox reaction, improved peak current and good potential resolution with high potential separation between p-BD and o-BD. Individual or selective determination of p-BD or o-BD in single substance solution or binary mixed solution is realized. Real analysis of pond water is also achieved.
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Affiliation(s)
- Huaxu Zhou
- Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; (H.Z.); (A.S.)
- Heihe Water Resources and Ecological Protection Research Center, Lanzhou 730030, China
| | - Guotao Dong
- Heihe Water Resources and Ecological Protection Research Center, Lanzhou 730030, China
| | - Ajabkhan Sailjoi
- Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; (H.Z.); (A.S.)
| | - Jiyang Liu
- Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; (H.Z.); (A.S.)
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Ameku WA, Ataide VN, Costa ET, Gomes LR, Napoleão-Pêgo P, William Provance D, Paixão TRLC, Salles MO, De-Simone SG. A Pencil-Lead Immunosensor for the Rapid Electrochemical Measurement of Anti-Diphtheria Toxin Antibodies. BIOSENSORS 2021; 11:489. [PMID: 34940247 PMCID: PMC8699316 DOI: 10.3390/bios11120489] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 11/25/2021] [Accepted: 11/28/2021] [Indexed: 05/13/2023]
Abstract
Diphtheria is a vaccine-preventable disease, yet immunization can wane over time to non-protective levels. We have developed a low-cost, miniaturized electroanalytical biosensor to quantify anti-diphtheria toxin (DTx) immunoglobulin G (anti-DTx IgG) antibody to minimize the risk for localized outbreaks. Two epitopes specific to DTx and recognized by antibodies generated post-vaccination were selected to create a bi-epitope peptide, biEP, by synthesizing the epitopes in tandem. The biEP peptide was conjugated to the surface of a pencil-lead electrode (PLE) integrated into a portable electrode holder. Captured anti-DTx IgG was measured by square wave voltammetry from the generation of hydroquinone (HQ) from the resulting immunocomplex. The performance of the biEP reagent presented high selectivity and specificity for DTx. Under the optimized working conditions, a logarithmic calibration curve showed good linearity over the concentration range of 10-5-10-1 IU mL-1 and achieved a limit of detection of 5 × 10-6 IU mL-1. The final device proved suitable for interrogating the immunity level against DTx in actual serum samples. Results showed good agreement with those obtained from a commercial enzyme-linked immunosorbent assay. In addition, the flexibility for conjugating other capture molecules to PLEs suggests that this technology could be easily adapted to the diagnoses of other pathogens.
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Affiliation(s)
- Wilson A. Ameku
- Oswaldo Cruz Foundation (FIOCRUZ), Center for Technological Development in Health (CDTS)/National Institute of Science and Technology for Innovation in Neglected Populations Diseases (INCT-IDPN), Rio de Janeiro 21040-900, Brazil; (W.A.A.); (L.R.G.); (P.N.-P.); (D.W.P.J.)
| | - Vanessa N. Ataide
- Electronic Languages and Electrochemical Sensors Laboratory, Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, São Paulo 05508-000, Brazil; (V.N.A.); (E.T.C.); (T.R.L.C.P.)
| | - Eric T. Costa
- Electronic Languages and Electrochemical Sensors Laboratory, Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, São Paulo 05508-000, Brazil; (V.N.A.); (E.T.C.); (T.R.L.C.P.)
| | - Larissa R. Gomes
- Oswaldo Cruz Foundation (FIOCRUZ), Center for Technological Development in Health (CDTS)/National Institute of Science and Technology for Innovation in Neglected Populations Diseases (INCT-IDPN), Rio de Janeiro 21040-900, Brazil; (W.A.A.); (L.R.G.); (P.N.-P.); (D.W.P.J.)
| | - Paloma Napoleão-Pêgo
- Oswaldo Cruz Foundation (FIOCRUZ), Center for Technological Development in Health (CDTS)/National Institute of Science and Technology for Innovation in Neglected Populations Diseases (INCT-IDPN), Rio de Janeiro 21040-900, Brazil; (W.A.A.); (L.R.G.); (P.N.-P.); (D.W.P.J.)
| | - David William Provance
- Oswaldo Cruz Foundation (FIOCRUZ), Center for Technological Development in Health (CDTS)/National Institute of Science and Technology for Innovation in Neglected Populations Diseases (INCT-IDPN), Rio de Janeiro 21040-900, Brazil; (W.A.A.); (L.R.G.); (P.N.-P.); (D.W.P.J.)
| | - Thiago R. L. C. Paixão
- Electronic Languages and Electrochemical Sensors Laboratory, Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, São Paulo 05508-000, Brazil; (V.N.A.); (E.T.C.); (T.R.L.C.P.)
- National Institute of Bioanalytical Science and Technology, Campinas 13084-971, Brazil
| | - Maiara O. Salles
- Institute of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro 21941-909, Brazil;
| | - Salvatore Giovanni De-Simone
- Oswaldo Cruz Foundation (FIOCRUZ), Center for Technological Development in Health (CDTS)/National Institute of Science and Technology for Innovation in Neglected Populations Diseases (INCT-IDPN), Rio de Janeiro 21040-900, Brazil; (W.A.A.); (L.R.G.); (P.N.-P.); (D.W.P.J.)
- Cellular and Molecular Department, Biology Institute, Federal Fluminense University, Niterói 24020-141, Brazil
- Epidemiology and Molecular Systematics Laboratory, Oswaldo Cruz Institute, FIOCRUZ, Rio de Janeiro 21040-900, Brazil
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Segan D, Stanley G, Messina P, Swiecicki J, Ngo K, Vivier V, Buriez O, Labbé E. Interaction of Redox Probes and Ferrocene‐labelled Peptides with Lipid Bilayers Observed at Lipid Bilayer‐Modified Electrodes. ChemElectroChem 2021. [DOI: 10.1002/celc.202100501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dejan Segan
- PASTEUR Département de chimie École Normale Supérieure PSL University Sorbonne Université CNRS 75005 Paris France
| | - George Stanley
- Laboratoire des biomolécules (LBM) Département de chimie École Normale supérieure PSL University Sorbonne Université CNRS 75005 Paris France
| | - Pierluca Messina
- PASTEUR Département de chimie École Normale Supérieure PSL University Sorbonne Université CNRS 75005 Paris France
| | - Jean‐Marie Swiecicki
- Laboratoire des biomolécules (LBM) Département de chimie École Normale supérieure PSL University Sorbonne Université CNRS 75005 Paris France
| | - Kieu Ngo
- Laboratoire Interfaces et Systèmes Électrochimiques (LISE) Sorbonne Université CNRS 75005 Paris France
| | - Vincent Vivier
- Laboratoire Interfaces et Systèmes Électrochimiques (LISE) Sorbonne Université CNRS 75005 Paris France
| | - Olivier Buriez
- PASTEUR Département de chimie École Normale Supérieure PSL University Sorbonne Université CNRS 75005 Paris France
| | - Eric Labbé
- PASTEUR Département de chimie École Normale Supérieure PSL University Sorbonne Université CNRS 75005 Paris France
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12
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Boonmee W, Samoson K, Yodrak J, Thiagchanya A, Phonchai A, Limbut W. Adsorptive Cathodic Stripping Voltammetry for Quantification of Alprazolam. Molecules 2021; 26:molecules26102958. [PMID: 34065709 PMCID: PMC8156809 DOI: 10.3390/molecules26102958] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 05/04/2021] [Accepted: 05/08/2021] [Indexed: 11/16/2022] Open
Abstract
A simple and highly sensitive electrochemical sensor was developed for adsorptive cathodic stripping voltammetry of alprazolam. Based on an electrochemically pretreated glassy carbon electrode, the sensor demonstrated good adsorption and electrochemical reduction of alprazolam. The morphology of the glassy carbon electrode and the electrochemically pretreated glassy carbon electrode were characterized by scanning electron microscopy/energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The electrochemical behaviors of alprazolam were determined by cyclic voltammetry, and the analytical measurements were studied by adsorptive cathodic stripping voltammetry. Optimized operational conditions included the concentration and deposition time of sulfuric acid in the electrochemical pretreatment, preconcentration potential, and preconcentration time. Under optimal conditions, the developed alprazolam sensor displayed a quantification limit of 0.1 mg L-1, a detection limit of 0.03 mg L-1, a sensitivity of 67 µA mg-1 L cm-2 and two linear ranges: 0.1 to 4 and 4 to 20 mg L-1. Sensor selectivity was excellent, and repeatability (%RSD < 4.24%) and recovery (82.0 ± 0.2 to 109.0 ± 0.3%) were good. The results of determining alprazolam in beverages with the developed system were in good agreement with results from the gas chromatography-mass spectrometric method.
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Affiliation(s)
- Waree Boonmee
- Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; (W.B.); (K.S.); (A.T.); (A.P.)
- Forensic Innovation Center, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
| | - Kritsada Samoson
- Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; (W.B.); (K.S.); (A.T.); (A.P.)
- Forensic Innovation Center, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
- Center of Excellence for Trace Analysis and Biosensor, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
- Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, HatYai, Songkhla 90112, Thailand
| | - Janjira Yodrak
- Satun Provincial Police Forensic Science, Police Forensic Science Center 9, Office of Police Forensic Science, Royal Thai Police, Mueangsatun, Satun 91000, Thailand;
| | - Adul Thiagchanya
- Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; (W.B.); (K.S.); (A.T.); (A.P.)
| | - Apichai Phonchai
- Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; (W.B.); (K.S.); (A.T.); (A.P.)
- Forensic Innovation Center, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
| | - Warakorn Limbut
- Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; (W.B.); (K.S.); (A.T.); (A.P.)
- Forensic Innovation Center, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
- Center of Excellence for Trace Analysis and Biosensor, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
- Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, HatYai, Songkhla 90112, Thailand
- Correspondence: ; Tel.: +66-74-288563
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Xuan L, Liao W, Wang M, Zhou H, Ding Y, Yan F, Liu J, Tang H, Xi F. Integration of vertically-ordered mesoporous silica-nanochannel film with electro-activated glassy carbon electrode for improved electroanalysis in complex samples. Talanta 2020; 225:122066. [PMID: 33592785 DOI: 10.1016/j.talanta.2020.122066] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/16/2020] [Accepted: 12/23/2020] [Indexed: 10/22/2022]
Abstract
Vertically-ordered mesoporous silica-nanochannel films (VMSF) with highly ordered nanochannels, uniform and adjustable pore size, ultra-thin thickness, and high porosity, have attracted considerable attention in analysis, molecular separation, catalysis, and nanomaterial synthesis. However, their widespread applications in practical electrochemical sensing are largely limited by the poor adhesion to common electrode materials, especially the lack of highly active substrate electrode to equip mechanically stable VMSF. Herein, we report a facile strategy to fabricate VMSF on widely used sensing electrodes without the use of any chemical adhesive for developing superior VMSF based electrochemical sensors. We demonstrate that simple electrochemical polarization (anodic polarization and subsequent cathodic reduction) to activate glassy carbon electrode (GCE) can generate a suitable surface environment allowing direct growth of stable VMSF on such pre-activated GCE (p-GCE) via electrochemically assisted self-assembly (EASA). Compared to traditional VMSF electrodes with ITO or organosilane grafted GCE as substrate, the developed VMSF/p-GCE exhibits much higher electrochemical response to four redox biomarkers (norepinephrine, dopamine, tryptophan, and uric acid). In-depth insights on mechanisms of the high electrochemical activity and incorporation stability of VMSF/p-GCE are made. We further demonstrate the VMSF/p-GCE can be employed to detect dopamine in real serum samples with exceptional sensitivity, low detection potential, as well as superior anti-interference and anti-fouling performance. In addition, high selectivity is realized as the common co-existing interference substances (ascorbic acid-AA and uric acid-UA) do not interfere with the detection.
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Affiliation(s)
- Lingli Xuan
- Department of Chemistry, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, PR China
| | - Wenyan Liao
- Affiliated International Zhuang Medicine Hospital, Guangxi University of Chinese Medicine, Nanning, 530023, PR China
| | - Meifang Wang
- Department of Chemistry, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, PR China
| | - Huaxu Zhou
- Department of Chemistry, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, PR China
| | - Yao Ding
- Guangxi University of Chinese Medicine, Nanning, 530020, PR China
| | - Fei Yan
- Department of Chemistry, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, PR China.
| | - Jiyang Liu
- Department of Chemistry, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, PR China
| | - Hongliang Tang
- The First Affiliated Hospital of Guangxi University of Chinese Medicine, Nanning, 530023, PR China.
| | - Fengna Xi
- Department of Chemistry, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, PR China.
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da Silva FD, Rocha RG, Rocha DP, Silva MN, Nossol E, Muñoz RA, Semaan FS, Dornellas RM. In situ electrochemical exfoliation of embedded graphite to superficial graphene sheets for electroanalytical purposes. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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15
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Bystron T, Sramkova E, Dvorak F, Bouzek K. Glassy carbon electrode activation – A way towards highly active, reproducible and stable electrode surface. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.01.066] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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16
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Báez DF, Tapia F, Sierra-Rosales P, Bollo S. In situ
Electroreduction of Graphene Oxide: Increased Sensitivity for the Determination of NADH. ELECTROANAL 2018. [DOI: 10.1002/elan.201800629] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Daniela F. Báez
- Centro de Investigación de Procesos Redox (CiPRex); Universidad de Chile; Sergio Livingstone Polhammer 1007, Independencia Santiago- Chile
- Advanced Center for Chronic Diseases (ACCDiS); Universidad de Chile; Sergio Livingstone Polhammer 1007, Independencia Santiago- Chile
| | - Felipe Tapia
- Centro de Investigación de Procesos Redox (CiPRex); Universidad de Chile; Sergio Livingstone Polhammer 1007, Independencia Santiago- Chile
| | - Paulina Sierra-Rosales
- Centro de Investigación de Procesos Redox (CiPRex); Universidad de Chile; Sergio Livingstone Polhammer 1007, Independencia Santiago- Chile
- Programa Institucional de Fomento a la Investigación, Desarrollo e Innovación; Universidad Tecnológica Metropolitana; Ignacio Valdivieso 2409, San Joaquín Santiago Chile
| | - Soledad Bollo
- Centro de Investigación de Procesos Redox (CiPRex); Universidad de Chile; Sergio Livingstone Polhammer 1007, Independencia Santiago- Chile
- Advanced Center for Chronic Diseases (ACCDiS); Universidad de Chile; Sergio Livingstone Polhammer 1007, Independencia Santiago- Chile
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17
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Pencil Lead as a Material for Microfluidic 3D-Electrode Assemblies. SENSORS 2018; 18:s18114037. [PMID: 30463263 PMCID: PMC6264025 DOI: 10.3390/s18114037] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 11/13/2018] [Accepted: 11/15/2018] [Indexed: 01/09/2023]
Abstract
We present an electrochemical, microfluidic system with a working electrode based on an ordered 3D array of pencil leads. The electrode array was integrated into a plexiglass/PDMS channel. We tested the setup using a simple redox probe and compared the results with computer simulations. As a proof of concept application of the device we showed that the setup can be used for determination of dopamine concentration in physiological pH and ultrasensitive, although only qualitative, detection of p-nitrophenol with a limit of detection below 1 nmol L−1. The observed limit of detection for p-nitrophenol is not only much lower than achieved with similar methods but also sufficient for evaluation of exposure to pesticides such as methyl parathion through urinalysis. This low cost setup can be fabricated without the need for clean room facilities and in the future, due to the ordered structure of the electrode could be used to better understand the process of electroanalysis and electrode functionalization. To the best of our knowledge it is the first application of pencil leads as 3D electrochemical sensor in a microfluidic channel.
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Canevari TC, Cincotto FH, Gomes D, Landers R, Toma HE. Magnetite Nanoparticles Bonded Carbon Quantum Dots Magnetically Confined onto Screen Printed Carbon Electrodes and their Performance as Electrochemical Sensor for NADH. ELECTROANAL 2017. [DOI: 10.1002/elan.201700167] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Thiago C. Canevari
- Engineering School; Presbyterian University Mackenzie; 01302-907 São Paulo, SP Brazil
- Institute of Chemistry; University of São Paulo; 05508-000 São Paulo, SP Brazil
| | - Fernando H. Cincotto
- Department Chemistry; Federal University of São Carlos; 13565-905 São Carlos, SP Brazil
| | - Delmarcio Gomes
- Institute of Chemistry; University of São Paulo; 05508-000 São Paulo, SP Brazil
| | - Richard Landers
- Institute of physic; University of Campinas; 13560-970 Campinas, SP Brazil
| | - Henrique E. Toma
- Institute of Chemistry; University of São Paulo; 05508-000 São Paulo, SP Brazil
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Santhiago M, Strauss M, Pereira MP, Chagas AS, Bufon CCB. Direct Drawing Method of Graphite onto Paper for High-Performance Flexible Electrochemical Sensors. ACS APPLIED MATERIALS & INTERFACES 2017; 9:11959-11966. [PMID: 28296386 DOI: 10.1021/acsami.6b15646] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A simple and fast fabrication method to create high-performance pencil-drawn electrochemical sensors is reported for the first time. The sluggish electron transfer observed on bare pencil-drawn surfaces was enhanced using two electrochemical steps: first oxidizing the surface and then reducing it in a subsequent step. The heterogeneous rate constant was found to be 5.1 × 10-3 cm s-1, which is the highest value reported so far for pencil-drawn surfaces. We mapped the origin of such performance by atomic force microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Our results suggest that the oxidation process leads to chemical and structural transformations on the electrode surface. As a proof-of-concept, we modified the pencil-drawn surface with Meldola's blue to electrocatalytically detect nicotinamide adenine dinucleotide (NADH). The electrochemical device exhibited the highest catalytic constant (1.7 × 105 L mol-1 s-1) and the lowest detection potential for NADH reported so far in paper-based electrodes.
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Affiliation(s)
- Murilo Santhiago
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM , 13083-970 Campinas, Brazil
| | - Mathias Strauss
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM , 13083-970 Campinas, Brazil
| | - Mariane P Pereira
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM , 13083-970 Campinas, Brazil
| | - Andréia S Chagas
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM , 13083-970 Campinas, Brazil
| | - Carlos C B Bufon
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM , 13083-970 Campinas, Brazil
- Institute of Chemistry (IQ), UNICAMP , 13083-970 Campinas, Brazil
- Institute of Physics "Gleb Wataghin" (IFGW), UNICAMP , 13083-859 Campinas, Brazil
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